煤特征参数与氧元素关系的实验研究
Experimental Research of the Relationship Between the Coal Characteristic Parameters and the Oxygen Element
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摘要: 为进一步揭示煤自燃内部因素对煤自然发火的影响，基于热重实验分析，得出了6种煤样在10 ℃/min升温速率下的特征参数值(活化能、吸氧量、特征温度点、自然发火期)与氧元素的关系。实验结果表明：随着煤氧元素的增大，煤自然发火期越短，而煤吸氧量则呈现先增大后减小的趋势，煤的活化能、燃烧特征温度点则越小。该实验结果指出煤的吸氧量与氧元素含量并非成正比，而是存在一个最佳浓度值，且氧元素并不是影响煤特征温度点大小的唯一因素，还可能与其他因素相关，为此有必要进一步研究煤内部因素对煤自燃的影响。Abstract: In order to explore the influence of internal factors of coal spontaneous combustion on the coal spontaneous combustion based on the thermo-gravimetric analysis, it obtained the characteristic parameters (activation energy, oxygen uptake, characteristic temperature points, and spontaneous combustion period) of six coal samples under the 10 ℃/min heating rate. The results showed that: as the coal oxygen element increasing, the period of coal spontaneous combustion was shorter, but the coal oxygen uptake appeared the trend that it first increased and then decreased, the coal activation energy and the combustion characteristic temperature points became smaller. The results indicated that the coal oxygen uptake was not proportional to the oxygen element content, the coal oxygen uptake had an optimal concentration value. And the oxygen element was not the only factor to affect the coal characteristic temperature points, it could be associated with other factors. Thus it was necessary to further study the impact of internal factors of coal on the coal spontaneous combustion.
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